Computer

deduplicate from 2nd temp file and overwrite 1st temp file, to save counting upwards all the time; we could do this on one line and pipe to another pipe and so on... but separating isn't such a bad thing

sort -d /tmp/abc.wk2 | uniq > /tmp/abc.wk1

Please note that Linux is case sensitive.

 # convert everything to lower case

tr '[A-Z]' '[a-z]' < /tmp/ABC.txt > /tmp/abc.txt

Most of the thrid party external printer servers (such as LevelOne, SureCom, Planet) can only support the following print language:

LPR, PTP, IPP & Appletalk

Other languages like GDI, HostBased are not supported. In other words, if you have a printer running GDI language (no matter it is USB or Parallel port),  your third party printer server cannot work as you wish.

awk command can split some strings with a specified field separator. The special variable FS (Field Separator) determines how awk will split up each record into fields.

For example, /etc/passwd has its fields separated by colons.

  awk -F: '{print $1:$3 }' /etc/passwd

This variable can actually be set to any regular expression, in the manner
of egrep(1).